General Characteristics of Hastelloy N Alloy

This is a nickel-base alloy that was originally developed as a container material for molten fluoride salts, to which it has good resistance in the temperature range 1300 to 1600ºF (705 to 870ºC).

The alloy has good oxidation resistance in air, and may be used to 1800ºF (980ºC) or intermittently to 1900ºF (1040ºC).

Applications

As previously mentioned, the alloy is mainly used as a container material for molten fluoride salts.

Forging

The alloy may be forged between 2200/1600ºF (1205/870ºC). Feedstock should be soaked for at least ½ hour per inch (2.5 cms) of thickness. Heavy reductions, 25-40%, are recommended to maintain internal heat and to minimize grain coarsening. For optimum corrosion resistance a solution anneal may be carried out following forging.

Heat treatment

A solution anneal at 2165ºF(1185ºC) followed by water quenching will restore optimum mechanical properties after hot work, and will give optimum corrosion resistance.

Machinability

The alloy work hardens rapidly, generates high heat during cutting, welds to cutting tool surface and offers high resistance to metal removal because of its high shear strength.
Machines should be rigid and overpowered as much as possible
Workpieces and tools should be held rigid.
Tools must be sharp: carbide tipped should be used for most applications but high-speed steel tools may be used for short production runs.
Heavy, constant feeds should be used.

Weldability

This alloy may be welded by the gas-metal-arc, gas-tungsten-arc and shielded-metal-arc processes. Parts may normally be used in the as-welded condition, but a post-weld anneal will result in optimum corrosion resistance.

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